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Acquisitions and License Agreements (Schedule of Unaudited Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 25, 2015
Mar. 25, 2016
Mar. 27, 2015
Mar. 25, 2016
Mar. 27, 2015
Apr. 16, 2015
Business Acquisition, Pro Forma Information [Line Items]            
Net sales, pro forma   $ 918.0 $ 969.2      
Pro forma, income from continuing operations   $ 120.5 $ 84.6 $ 246.5 $ 179.6  
Pro forma, basic earnings per share from continuing operations   $ 1.08 $ 0.73 $ 2.18 $ 1.56  
Pro forma, diluted earnings per shares from continuing operations   $ 1.08 $ 0.72 $ 2.16 $ 1.54  
2023 Notes [Member] | Therakos            
Business Acquisition, Pro Forma Information [Line Items]            
Interest rate 5.625%          
2020 Notes | Ikaria, Inc.            
Business Acquisition, Pro Forma Information [Line Items]            
Interest rate           4.875%
2025 Notes | Ikaria, Inc.            
Business Acquisition, Pro Forma Information [Line Items]            
Interest rate           5.50%
2015 Revolving Credit Facility            
Business Acquisition, Pro Forma Information [Line Items]            
Line of Credit Facility, Interest Rate on date of acquisition 2.58%